Imagine you’re climbing up a steep hill and you stop at the halfway point. You have two choices at that point, you can look upward and see how far you have to climb, or you can look back, and see how far you’ve come. What will you choose? Will you choose to see what you’ve accomplished and be proud of yourself, or will you look at what you have left to do and let it rob you of your joy?
Ref – Think Positive 30.